My email folders missing, so incoming MacWorld emails disappear
I used to have email folders and "rules" before the last two OS upgrades. One rule was for messages from MacWorld go to the "MacWorld" folder. Now the folder is gone so I cannot get MacWorld emails anymore. I know they come thru because I see them for a SPLIT second and then they disappear into darkness. I checked the Settings--Rules and there is no longer a "rules" for Macworld. Where are my emails going? How can I rebuild iCloud Mail? What is going on? I have spent countless days trying to figure this out and now need the help and advice of experts.
iMac, OS X Yosemite (10.10.3), 1.8 ghz; 1.25 GB SDRAM; 80GB HD